<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <p>{{ content }}</p>
    <p v-text="content"></p>
    <input
      type="text"
      v-model="content"
    >
  </div>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.6.12"></script>
  <script>
    const vm = new Vue({
      el: '#app',
      data: {
        content: '默认文本内容'
      }
    })
  </script>
</body>
</html>